203: Finished ipa_types.check_min_max() function; added corresponding unit tests; ipa_types.Int now uses check_min_max()

ipalib/ipa_types.py

@@ -25,6 +25,26 @@ from plugable import ReadOnly, lock
 import errors
 
 
+def check_min_max(min_value, max_value, min_name, max_name):
+    assert type(min_name) is str, 'min_name must be an str'
+    assert type(max_name) is str, 'max_name must be an str'
+    for (name, value) in [(min_name, min_value), (max_name, max_value)]:
+        if not (value is None or type(value) is int):
+            raise TypeError(
+                '`%s` must be an int or None, got: %r' % (name, value)
+            )
+    if None not in (min_value, max_value) and min_value >= max_value:
+        d = dict(
+            k0=min_name,
+            v0=min_value,
+            k1=max_name,
+            v1=max_value,
+        )
+        raise ValueError(
+            '%(k1)s > %(k0)s: %(k0)s=%(v0)r, %(k1)s=%(v1)r' % d
+        )
+
+
 class Type(ReadOnly):
     """
     Base class for all IPA types.
@@ -47,16 +67,7 @@ class Int(Type):
     type = int
 
     def __init__(self, min_value=None, max_value=None):
-        args = (min_value, max_value)
+        check_min_max(min_value, max_value, 'min_value', 'max_value')
-        for arg in args:
-            if not (arg is None or type(arg) is int):
-                raise TypeError('Must be an int or None: %r' % arg)
-        if None not in args and min_value >= max_value:
-            raise ValueError(
-                'min_value not less than max_value: %r, %r' % (
-                    min_value, max_value
-                )
-            )
         self.min_value = min_value
         self.max_value = max_value
         lock(self)
@@ -70,22 +81,6 @@ class Int(Type):
             return 'Cannot be larger than %d' % self.max_value
 
 
-def check_min_max(min_name, min_value, max_name, max_value):
-    assert type(min_name) is str, 'min_name must be an str'
-    assert type(max_name) is str, 'max_name must be an str'
-    for (name, value) in [(min_name, min_value), (max_name, max_value)]:
-        if not (value is None or type(value) is int):
-            raise TypeError(
-                '%s must be an int or None, got: %r' % (name, value)
-            )
-#    if None not in (min_value, max_value) and min_value >= max_value:
-#        raise ValueError(
-#            'min_value not less than max_value: %r, %r' % (
-#                min_value, max_value
-#            )
-#        )
-
-
 class Unicode(Type):
     def __init__(self, min_length=None, max_length=None, pattern=None):
         integers = (min_length, max_length)

ipalib/tests/test_ipa_types.py

@@ -30,6 +30,13 @@ def test_check_min_max():
     Tests the `ipa_types.check_min_max` function.
     """
     f = ipa_types.check_min_max
+    okay = [
+            (None, -5),
+            (-20, None),
+            (-20, -5),
+    ]
+    for (l, h) in okay:
+        assert f(l, h, 'low', 'high') is None
     fail_type = [
         '10',
         10.0,
@@ -39,11 +46,18 @@ def test_check_min_max():
         object,
     ]
     for value in fail_type:
-        e = raises(TypeError, f, 'low', value, 'high', None)
+        e = raises(TypeError, f, value, None, 'low', 'high')
-        assert str(e) == 'low must be an int or None, got: %r' % value
+        assert str(e) == '`low` must be an int or None, got: %r' % value
-        e = raises(TypeError, f, 'low', None, 'high', value)
+        e = raises(TypeError, f, None, value, 'low', 'high')
-        assert str(e) == 'high must be an int or None, got: %r' % value
+        assert str(e) == '`high` must be an int or None, got: %r' % value
-
+    fail_value = [
+        (10, 5),
+        (-5, -10),
+        (5, -10),
+    ]
+    for (l, h) in fail_value:
+        e = raises(ValueError, f, l, h, 'low', 'high')
+        assert str(e) == 'high > low: low=%r, high=%r' % (l, h)
 
 
 class test_Type(ClassChecker):
@@ -56,36 +70,52 @@ class test_Type(ClassChecker):
         assert self.cls.__bases__ == (plugable.ReadOnly,)
 
 
-
 class test_Int(ClassChecker):
     _cls = ipa_types.Int
 
+    def test_class(self):
+        assert self.cls.__bases__ == (ipa_types.Type,)
+        assert self.cls.type is int
+
     def test_init(self):
         o = self.cls()
+        assert o.name == 'Int'
         assert o.min_value is None
         assert o.max_value is None
+
         okay = [
             (None, -5),
             (-20, None),
             (-20, -5),
         ]
+        for (l, h) in okay:
+            o = self.cls(min_value=l, max_value=h)
+            assert o.min_value is l
+            assert o.max_value is h
+
         fail_type = [
-            (None, 10L),
+            '10',
-            (5L, None),
+            10.0,
-            (None, '10'),
+            10L,
-            ('5', None),
+            True,
+            False,
+            object,
         ]
+        for value in fail_type:
+            e = raises(TypeError, self.cls, min_value=value)
+            assert str(e) == (
+                '`min_value` must be an int or None, got: %r' % value
+            )
+            e = raises(TypeError, self.cls, max_value=value)
+            assert str(e) == (
+                '`max_value` must be an int or None, got: %r' % value
+            )
+
         fail_value = [
             (10, 5),
             (5, -5),
             (-5, -10),
         ]
-        for (l, h) in okay:
-            o = self.cls(min_value=l, max_value=h)
-            assert o.min_value is l
-            assert o.max_value is h
-        for (l, h) in fail_type:
-            raises(TypeError, self.cls, min_value=l, max_value=h)
         for (l, h) in fail_value:
             raises(ValueError, self.cls, min_value=l, max_value=h)